Process DCS chain parking signal alarm device based on intermediate relay contact monitoring

Abstract

The utility model discloses a process DCS chain parking signal alarm device based on intermediate relay contact monitoring, and relates to the technical field of electronic circuit monitoring. Comprising a photoelectric coupler, an operational amplifier, a switching diode D2, triodes Q1 and Q2, a light emitting diode D1, a piezoelectric ceramic piece HTD, a plurality of resistors, capacitors C1 and C2, a reset button and a detection point switch. The photoelectric coupler comprises an A214a, an A214b and an A214c, the A214a, the A214b and the A214c form a monitoring triggering device, and an electronic switch clamping interlocking trigger is formed; the operational amplifier comprises an SF324a and an SF324b, and an alarm sounding device is formed by the SF324a and the SF324b; the light emitting diode D1 is an alarm indicating device. According to the utility model, sound-light alarm is given out after a signal is triggered, the alarm state is still kept until manual reset after the signal is returned, and continuity and stability of production are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit monitoring technical field, concretely is process DCS interlock parking signal alarm device based on intermediate relay contact monitoring. BACKGROUND

[0002] In petrochemical enterprises, the continuous and stable operation of field motors is crucial to production activities. However, in actual operation, motor shutdown occurs from time to time due to various reasons such as motor overcurrent, overload, and process DCS interlock parking. Once the motor is shut down, in order to resume production as soon as possible, electrical operation personnel need to quickly identify the cause and restore normal operation of the motor. However, due to the special situation of process DCS interlock shutdown (5S pulse signal), the shutdown signal returns after 5S, and if DCS does not have relevant fault records, it becomes extremely difficult to determine the shutdown cause, which seriously affects the fault handling efficiency of electrical operation personnel, leading to prolonged production interruption time and increased production cost for enterprises, so there is an urgent need for a technical means to solve this problem.

[0003] Traditionally, when determining the cause of motor shutdown, for electrical faults leading to shutdown, it is relatively simple to handle, and electrical operation personnel can find and determine the fault cause on the electrical distribution cabinet. However, when encountering process DCS interlock shutdown, due to the short and easily disappearing nature of the shutdown signal, if DCS does not record the fault, traditional methods cannot quickly and accurately determine the fault cause. This shortcoming makes it often necessary to spend a lot of time troubleshooting when handling such shutdown faults, seriously affecting the continuity and stability of production and reducing production efficiency.

[0004] Currently, existing motor operation monitoring technology still has deficiencies in dealing with process DCS interlock shutdown problems. Although some monitoring equipment can monitor some operating parameters of the motor, for process DCS interlock shutdown, which has special signal characteristics, there is a lack of effective monitoring and recording means. In the face of 5S pulse type shutdown signals, existing technology cannot timely capture and store signal information, making it difficult to trace and determine the root cause of the fault. This deficiency not only increases the difficulty and time cost of troubleshooting, but also causes greater impact on the entire production system due to delayed fault handling, reducing the safety and reliability of enterprise production.

[0005] Therefore, the present application proposes a process DCS interlock parking signal alarm device based on intermediate relay contact monitoring, which uses the normally open auxiliary contact of the intermediate relay in the electrical distribution cabinet as a monitoring point, solving the problem of existing technology being unable to effectively monitor process DCS interlock shutdown (5S pulse signal) and being difficult to determine the shutdown cause after the signal returns. SUMMARY

[0006] Based on the above, the application is based on the intermediate relay contact monitoring process DCS interlock parking signal alarm device, including photoelectric coupler, operational amplifier, switch diode D2, triode Q1 and Q2, light emitting diode D1, piezoelectric ceramic sheet HTD, a plurality of resistors, capacitor C1, C2, reset button and detection point switch;

[0007] The photoelectric coupler comprises A214a, A214b and A214c, and the monitoring trigger device is formed by A214a, A214b and A214c, and the electronic switch clamping interlocking trigger is formed.

[0008] The operational amplifier comprises SF324a and SF324b, and the alarm sounding device is formed by SF324a and SF324b.

[0009] The light emitting diode D1 is an alarm indicating device.

[0010] The detection point switch is connected with the photoelectric coupler A214a, and after triggering, A214a is turned on, A214b and A214c are driven, A214c outputs a signal to the triode Q1, the state of Q1 is changed to affect the triode Q2, the triode Q2 controls the operational amplifier SF324a to work, the switch diode D2 cooperates with Q2 to stabilize the circuit, and the operational amplifier SF324b outputs a signal to drive the piezoelectric ceramic sheet HTD to sound an alarm.

[0011] The light emitting diode D1 is controlled to emit light and indicate under the signal control.

[0012] The resistors and the capacitors C1 and C2 adjust the circuit.

[0013] The reset button can release the alarm state, and the alarm device restores the monitoring.

[0014] Preferably, the photoelectric coupler A214a, A214b and A214c form the monitoring trigger device, and specifically comprises that the photoelectric coupler comprises a 1-pin, a 2-pin, a 3-pin and a 4-pin; the 2-pin of A214a is connected with the detection point switch, the inside of A214a is electrified with the light emitting diode D1 when the switch is closed, so that the 3-pin and the 4-pin are turned on; the 3-pin of A214a is connected with the 1-pin of A214b and A214c to supply power for the light emitting diode D1; A214b and A214c are connected in series, the 2-pin of A214b and A214c is grounded, the 3-pin and the 4-pin of A214b and A214c are turned on when the light emitting diode D1 emits light; the 4-pin of A214b is connected with the 1-pin of itself to realize self-locking, the 3-pin of A214c outputs a signal to trigger the subsequent alarm circuit, and the monitoring trigger device is formed.

[0015] Preferably, the alarm device further comprises triodes Q1 and Q2, the base of the triode Q1 is connected with A214c through a resistor, the collector is connected to the alarm sound device, and the emitter is grounded; the base of the triode Q2 is connected with a resistor, the collector is connected to the switch diode D2, and the emitter is grounded; the triode Q1 controls whether the alarm sound device works, and the triode Q2 stabilizes the circuit of the alarm device.

[0016] Preferably, the anode of the switch diode D2 is connected with the collector of the triode Q2, and the cathode of the switch diode D2 is connected with a resistor; the switch diode D2 prevents reverse current from affecting the circuit, stabilizes the voltage of the circuit, and avoids abnormal voltage fluctuation from interfering with the normal work of the alarm sound device.

[0017] Preferably, the operational amplifiers SF324a and SF324b constitute the alarm sound device, and specifically comprise:

[0018] The operational amplifier SF324a comprises an outer 4-pin, 9-pin, 10-pin and 11-pin; the operational amplifier SF324b comprises an outer 12-pin, 13-pin and 14-pin; the 4-pin of the operational amplifier SF324a is connected with a positive power supply, the 11-pin is grounded, the triode Q1 controls the 4-pin of SF324a to open the power supply; the 9-pin and 10-pin of SF324a are connected with peripheral resistance and capacitance elements to constitute an oscillation circuit to generate a frequency signal, the signal is transmitted to the 12-pin of SF324b, the 13-pin is connected with the triode Q2 and the capacitor C2, and after being amplified by SF324b, a signal is output from the 14-pin to drive the piezoelectric ceramic sheet HTD to emit an alarm sound and perform alarm sounding.

[0019] Preferably, one end of the piezoelectric ceramic sheet HTD is connected with the output end of the operational amplifier SF324b, and the other end is grounded; when the monitoring trigger device detects a process DCS interlocking parking signal, the piezoelectric ceramic sheet HTD receives an electrical signal output by the operational amplifier, converts the electrical signal into mechanical vibration, emits an alarm sound, and reminds electrical operators that the motor has stopped due to the process DCS interlocking.

[0020] Compared with the prior art, the technical scheme of the application has the following technical effects:

[0021] The utility model discloses a reset button and the connection design of whole circuit in digital signal monitoring device and the working mechanism of mutual cooperation between each element, solve the technical problem that the prior art cannot recover the monitoring state quickly after processing process DCS interlock shutdown fault. After the alarm of the device, only the electrical operation personnel confirms the parking reason and pressed the reset button, the digital signal monitoring device will cancel the alarm state, and enters the monitoring state again. This design avoids the alarm signal continuous interference to the staff, ensures that the staff can concentrate on processing the current fault, and at the same time, after the completion of fault processing, the device can quickly recover to the monitoring state, ready to cope with the next process DCS interlock shutdown situation, improves the reliability and stability of the whole monitoring system, provides more reliable guarantee for the stable operation of the motor of petroleum chemical enterprise, reduces the potential production risk.

[0022] The utility model discloses a reset button and the connection design of whole circuit in digital signal monitoring device and the working mechanism of mutual cooperation between each element, solve the technical problem that the prior art cannot recover the monitoring state quickly after processing process DCS interlock shutdown fault. After the alarm of the device, only the electrical operation personnel confirms the parking reason and pressed the reset button, the digital signal monitoring device will cancel the alarm state, and enters the monitoring state again. This design avoids the alarm signal continuous interference to the staff, ensures that the staff can concentrate on processing the current fault, and at the same time, after the completion of fault processing, the device can quickly recover to the monitoring state, ready to cope with the next process DCS interlock shutdown situation, improves the reliability and stability of the whole monitoring system, provides more reliable guarantee for the stable operation of the motor of petroleum chemical enterprise, reduces the potential production risk.

[0023] The above description is only the summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, so as to be implemented according to the content of the specification, and in order to let the above and other purposes, characteristics and advantages of the application can be more obvious and easy to understand, the following detailed description of the preferred embodiments of the application and the accompanying drawings as follows.

[0024] According to the detailed description of the specific embodiments of the application in the following combined with the drawings, those skilled in the art will be more clear the above and other purposes, advantages and characteristics of the application. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative effort. In all the drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, the elements or parts are not necessarily drawn according to the actual proportions.

[0026] Figure 1 The circuit structure diagram of the process DCS interlocking parking signal alarm device based on intermediate relay contact monitoring. DETAILED DESCRIPTION

[0027] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. In the following description, the specific details such as specific configurations and components are provided only to help the overall understanding of the embodiments of the present application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, in order to be clear and concise, the description of known functions and structures is omitted in the embodiments.

[0028] It should be understood that the "one embodiment" or "the embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "one embodiment" or "the embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0029] In addition, the reference numerals and / or letters can be repeated in different examples in the present application. Such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or arrangements discussed.

[0030] The term "and / or" herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, B alone and A and B together. The term "and" herein is a description of another association relationship of the associated objects, which means that there can be two relationships, for example, A and B, which means that there are two cases of A alone and A and B together. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0031] The term "at least one" herein is only used to describe associated objects, which means that there can be three relationships, for example, at least one of A and B, which can mean that A exists alone, A and B exist together, and B exists alone.

[0032] It should also be noted that the relationship terms such as first and second in this text are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion. Embodiment

[0033] This embodiment mainly describes a process DCS interlocking parking signal alarm device based on intermediate relay contact monitoring, which includes a photoelectric coupler, an operational amplifier, a switching diode D2, transistors Q1 and Q2, a light-emitting diode D1, a piezoelectric ceramic sheet HTD, a plurality of resistors, capacitors C1 and C2, a reset button and a detection point switch.

[0034] The photoelectric coupler includes A214a, A214b and A214c, which form a monitoring trigger device through A214a, A214b and A214c, and form an electronic switch clamping interlocking trigger.

[0035] The operational amplifier includes SF324a and SF324b, which form an alarm sounding device through SF324a and SF324b.

[0036] The light-emitting diode D1 is an alarm indication device.

[0037] The detection point switch is connected to the photoelectric coupler A214a, which is turned on after triggering, driving A214b and A214c to be turned on, and outputting a signal from A214c to transistor Q1. The state change of Q1 affects transistor Q2, which controls the operation of operational amplifier SF324a. The switching diode D2 cooperates with Q2 to stabilize the circuit. The operational amplifier SF324b outputs a signal to drive the piezoelectric ceramic sheet HTD to sound an alarm.

[0038] The light-emitting diode D1 is controlled by a signal to emit light and indicate.

[0039] The resistors and capacitors C1 and C2 adjust the circuit.

[0040] The reset button can cancel the alarm state, and the alarm device returns to monitoring.

[0041] Further, the optoelectronic couplers A214a, A214b and A214c constitute a monitoring trigger device, which specifically comprises: the optoelectronic couplers A214a, A214b and A214c have 1 pin, 2 pin, 3 pin and 4 pin; the 2 pin of the A214a is connected to a detection point switch, when the switch is closed, the inside of the A214a is powered on with the light-emitting diode D1, so that the 3 pin and 4 pin are turned on; the 3 pin of the A214a is connected to the 1 pin of the A214b and the A214c, and supplies power to the light-emitting diode D1; the A214b and the A214c are connected in series, the 2 pin of the A214b and the A214c is grounded, when the light-emitting diode D1 emits light, the 3 pin and 4 pin of the A214b and the A214c are turned on; the 4 pin of the A214b is connected to the 1 pin of the A214b to realize self-locking, and the 3 pin of the A214c outputs a signal to trigger a subsequent alarm circuit, thereby constituting a monitoring trigger device.

[0042] Further, the alarm device further comprises transistors Q1 and Q2, the base of the transistor Q1 is connected to the A214c through a resistor, the collector is connected to an alarm sound device, and the emitter is grounded; the base of the transistor Q2 is connected to a resistor, the collector is connected to a switching diode D2, and the emitter is grounded; the transistor Q1 controls whether the alarm sound device works, and the transistor Q2 stabilizes the alarm device circuit.

[0043] Further, the anode of the switching diode D2 is connected to the collector of the transistor Q2, and the cathode of the switching diode D2 is connected to a resistor; the switching diode D2 prevents reverse current from affecting the circuit, stabilizes the voltage of the circuit, and avoids abnormal voltage fluctuation from interfering with the normal work of the alarm sound device.

[0044] Further, the operational amplifiers SF324a and SF324b constitute an alarm sound device, which specifically comprises:

[0045] The operational amplifier SF324a has 4 pin, 9 pin, 10 pin and 11 pin on the outside; the operational amplifier SF324b has 12 pin, 13 pin and 14 pin on the outside; the 4 pin of the operational amplifier SF324a is connected to a positive power supply, and the 11 pin is grounded; the transistor Q1 controls the 4 pin of the SF324a to open the power supply; the 9 pin and 10 pin of the SF324a and peripheral resistance and capacitance elements constitute an oscillation circuit to generate a frequency signal, which is transmitted to the 12 pin of the SF324b; the 13 pin is connected to the transistor Q2 and the capacitor C2; after being amplified by the SF324b, a signal is output from the 14 pin to drive the piezoelectric ceramic sheet HTD to emit an alarm sound and perform alarm sounding.

[0046] Further, one end of the piezoelectric ceramic sheet HTD is connected to the output end of the operational amplifier SF324b, and the other end is grounded; when the monitoring trigger device detects a process DCS interlocking shutdown signal, the piezoelectric ceramic sheet HTD receives an electrical signal output by the operational amplifier, converts it into mechanical vibration, emits an alarm sound, and reminds the electrical operator that the motor has stopped due to the process DCS interlocking.

[0047] The embodiment describes in detail that the normally open auxiliary contact of the intermediate relay in the electrical distribution cabinet is used as the monitoring point by the process DCS, which solves the problem that the existing technology cannot effectively monitor the process DCS interlocking shutdown (5S pulse signal) and it is difficult to determine the shutdown reason after the signal returns. When the shutdown signal is monitored, the green LED light of the device is turned on, and the buzzer alarm is sounded. Even if the signal returns, the sound and light alarm does not disappear until manual reset. This enables the electrical operator to quickly know and determine the shutdown reason, greatly improves the fault judgment and processing efficiency, reduces the impact of motor shutdown on production, and ensures the continuity and stability of the production of petrochemical enterprises.

[0048] Based on embodiment 1, this embodiment describes that the photoelectric coupler A214a, A214b and A214c constitute a monitoring trigger device, specifically:

[0049] The 2-pin of the photoelectric coupler is connected to the monitoring point switch, which is usually the normally open auxiliary contact of the intermediate relay 1KA of the process DCS in the electrical distribution cabinet; the 3-pin of A214a is connected to the 1-pin of A214b and A214c, providing a current path for the light-emitting diodes of the latter two; and the 4-pin is grounded.

[0050] The 2-pin of the photoelectric coupler A214b is grounded, and the 3-pin is connected to the base of the transistor Q1 in the subsequent alarm sound device, which is used to control the conduction state of the transistor Q1; the 4-pin is connected to the 1-pin of itself, forming a self-locking loop.

[0051] The 2-pin of the photoelectric coupler A214c is grounded, and the 3-pin is also connected to the base of the transistor Q1, which cooperates with A214b to control the transistor Q1; and the 4-pin is grounded.

[0052] When the motor is interlocked and shut down due to the process DCS, the monitoring point switch is closed, at which time the 2-pin of A214a forms a current loop, and the internal light-emitting diode is powered on and emits light. The light emitted by the light-emitting diode irradiates the photosensitive triode inside A214a, making it conductive, thereby forming a conduction state between the 3-pin and the 4-pin of A214a.

[0053] After the 3-pin of the photoelectric coupler A214a is conductive, the current flows to the 1-pin of A214b and A214c, causing the internal light-emitting diodes of A214b and A214c to also be powered on and emit light. Similarly, the light irradiation causes the photosensitive triodes inside A214b and A214c to conduct, and the 3-pin and the 4-pin of A214b and A214c are conductive.

[0054] The 4-pin of the photoelectric coupler A214b is connected to the 1-pin of itself to form a self-locking loop. When A214b is conductive, even if the monitoring point switch is turned off, due to the existence of the self-locking loop, the internal light-emitting diode of A214b still has current passing through, continuously maintaining the conductive state, thereby keeping the entire electronic switch clamp interlocking trigger in the triggered state.

[0055] After the 3-pin conduction of the photoelectric coupler A214b and A214c, the output signal is output to the base of the transistor Q1, so that the transistor Q1 is turned on. The on state of the transistor Q1 further affects the working state of the subsequent alarm sounding device, such as controlling the working state of the operational amplifier SF324, and finally driving the piezoelectric ceramic sheet HTD to emit an alarm sound, realizing the monitoring and alarm function of the process DCS interlocking shutdown signal. Until the reset button is pressed, the self-locking loop is cut off, and the entire device will return to the initial monitoring state.

[0056] This embodiment describes in detail the monitoring trigger device composed of photoelectric couplers A214a, A214b and A214c, which accurately and reliably monitors the process DCS interlocking shutdown signal; at the moment of motor shutdown, it quickly responds to trigger and maintains the triggered state through the self-locking of A214b, ensuring that the alarm signal will not be interrupted due to the disappearance of the short-term shutdown signal. This design allows electrical operators to timely detect the shutdown condition and accurately determine the fault type, greatly improving the fault response speed and processing efficiency, and effectively ensuring the continuity and stability of the production of petrochemical enterprises.

[0057] Based on Embodiment 1, this embodiment describes the alarm sounding device composed of operational amplifiers SF324a and SF324b, specifically:

[0058] The 4-pin of the operational amplifier SF324a is the positive power supply pin, connected to the positive power supply; the 11-pin is the negative power supply pin, usually grounded, providing a stable potential reference; the transistor Q1 controls the level state of the 4-pin of the operational amplifier SF324a, and when the trigger condition is met, such as the closing of the monitoring point switch to make the photoelectric coupler act, the transistor Q1 is cut off, making the 4-pin of the operational amplifier SF324a become high level, turning on the working power supply of the alarm sounding device.

[0059] The 9-pin and 10-pin of the operational amplifier SF324a form an oscillation circuit with peripheral resistance and capacitor elements; the 9-pin of the operational amplifier SF324a is the inverting input terminal, and the 10-pin is the non-inverting input terminal; by configuring the parameters of the external resistance and capacitor elements, the operational amplifier SF324a forms an oscillation signal of a specific frequency, generating a basic frequency signal of the alarm sound.

[0060] The 12-pin (inverting input terminal) of the operational amplifier SF324b is connected to the output point of the oscillation circuit of the operational amplifier SF324a to receive the oscillation signal from SF324a;

[0061] The 13-pin (non-inverting input terminal) of the operational amplifier SF324b is connected to a suitable reference potential through resistance and other elements to ensure the accuracy and stability of signal amplification;

[0062] After the amplification processing of the operational amplifier SF324b, the amplified signal is output from pin 14 (output terminal). This amplified signal has sufficient power to drive the piezoelectric ceramic sheet HTD to emit an alarm sound.

[0063] Through the specific connection between the pins of the operational amplifiers SF324a and SF324b and the cooperation with peripheral elements, SF324a and SF324b successfully constitute an alarm sound emitting device that stably emits an alarm sound when the trigger condition is met.

[0064] The alarm sound emitting device of this embodiment details the cooperative work of SF324a and SF324b, ensuring that when the process DCS interlocking shutdown signal is triggered, an alarm can be reliably and timely emitted, providing clear fault prompts for electrical operators, greatly improving the response speed to motor shutdown faults. Through precise circuit design and component parameter configuration, the frequency and volume of the alarm sound can meet the actual use requirements, even in complex petrochemical production environments, the staff can clearly hear the alarm, facilitating timely measures to handle faults, effectively ensuring the continuity and safety of production.

[0065] Based on embodiment 1, this embodiment details the resistors in embodiment 1, specifically including:

[0066] Resistors R1, R2, and R3 are low resistance type, with a range of tens to hundreds of ohms, and a power of generally 1 / 4 W, capable of withstanding a certain current; R5, R6, R7, R10, and R11 have slightly larger resistance values, ranging from several thousand to several tens of thousands of ohms, with a power of mostly 1 / 8 W, and higher accuracy requirements for resistance values; R8, R9, R12, R13, and R14 are high resistance resistors, with a value of tens of thousands of ohms, and a power of usually 1 / 16 W, suitable for scenes with strict current limitations.

[0067] Resistors R1 and R2 are connected in series in the input loop of the power supply and photoelectric couplers A214a and A214b. According to Ohm's law, they can effectively control the current flowing into the photoelectric coupler within a safe threshold, avoiding damage to components due to excessive current, and ensuring that the photoelectric coupler stably converts the input signal into an optical signal output. Resistor R3 is located in the base loop of the transistor Q1, limiting the base current to allow the transistor to work in a normal amplification or switching state, preventing damage or abnormal work of the transistor due to abnormal base current.

[0068] The resistances bear the responsibility of voltage regulation and signal processing. In the circuit of the operational amplifier SF324, the resistances R5 and R6 constitute a voltage dividing circuit to provide an accurate reference voltage for the input end, ensuring that the operational amplifier accurately performs amplification, comparison and other operations according to the input signal, thereby controlling the alarm sounding device; the resistances R7 and R8 participate in adjusting the amplification factor and stability of the operational amplifier in the feedback loop, ensuring that the output signal is accurate and stable. In the circuit of the switching diode D2, the resistance R11 cooperates with D2 to play an isolation and protection role, stabilize the circuit voltage, and prevent abnormal voltage from interfering with signal transmission; in the reset circuit, the resistances R12 and R13 cooperate with the capacitor to determine the time constant of the reset signal, accurately control the reset process, and enable the device to quickly return to the initial monitoring state after troubleshooting, thereby ensuring reliable operation of the entire digital signal monitoring device.

[0069] The embodiment describes the role of resistances in the circuit in detail, which guarantees the safety of components such as photoelectric couplers and triodes through current limiting, enables them to work stably, ensures the accurate amplification of signals by the operational amplifier through voltage division and feedback, and drives the alarm sounding device to operate normally, and sets a reasonable reset time in the reset circuit to ensure that the device quickly returns to monitoring after troubleshooting. These resistances work together to comprehensively improve the stability, accuracy and reliability of the digital signal monitoring device.

[0070] The above is only a preferred embodiment of the utility model, and does not limit the protection scope of the utility model. For those skilled in the art, the utility model can be changed and varied in various ways; any change, modification, replacement, integration and parameter change of these embodiments within the spirit and principles of the utility model, which can realize the same function without departing from the principles and spirits of the utility model, falls within the protection scope of the utility model.

Claims

1. A process DCS interlock trip signal alarm device based on intermediate relay contact monitoring, characterized in that, It includes photoelectric coupler, operational amplifier, switch diode D2, triode Q1 and Q2, light emitting diode D1, piezoelectric ceramic HTD, several resistors, capacitors C1 and C2, reset button and detection point switch; The photoelectric coupler includes A214a, A214b and A214c, and the monitoring trigger device is formed by A214a, A214b and A214c. The operational amplifier includes SF324a and SF324b, and the alarm sounding device is formed by SF324a and SF324b. The light emitting diode D1 is an alarm indicating device. The detection point switch is connected with the photoelectric coupler A214a, and after triggering, A214a is turned on, A214b and A214c are driven to be turned on, A214c outputs a signal to the triode Q1, the state of Q1 is changed to affect the triode Q2, Q2 controls the operational amplifier SF324a to work, and the switch diode D2 cooperates with Q2 to stabilize the circuit; the operational amplifier SF324b outputs a signal to drive the piezoelectric ceramic HTD to sound an alarm. The light emitting diode D1 is controlled by a signal to emit light and indicate. The resistors and the capacitors C1 and C2 adjust the circuit. The reset button can remove the alarm state, and the alarm device restores the monitoring.

2. The process DCS interlock trip signal alarm device based on intermediate relay contact monitoring according to claim 1, characterized in that, The photoelectric coupler A214a, A214b and A214c form the monitoring trigger device, and specifically include that the photoelectric coupler includes 1 pin, 2 pin, 3 pin and 4 pin; the 2 pin of A214a is connected with the detection point switch, and when the switch is closed, the inside of A214a is electrified with the light emitting diode D1 to make the 3 pin and the 4 pin conduct; the 3 pin of A214a is connected with the 1 pin of A214b and A214c to supply power for the light emitting diode D1; A214b and A214c are connected in series, the 2 pin of A214b and A214c is grounded, when the light emitting diode D1 emits light, the 3 pin and the 4 pin of A214b and A214c are turned on; the 4 pin of A214b is connected with the 1 pin of itself to realize self-locking, the 3 pin of A214c outputs a signal to trigger the subsequent alarm circuit, and the monitoring trigger device is formed.

3. The process DCS interlock trip alarm device based on intermediate relay contact monitoring according to claim 1, characterized in that, The alarm device further includes the triode Q1 and Q2, the base of the triode Q1 is connected with the photoelectric coupler A214c through a resistor, the collector is connected to the alarm sounding device, and the emitter is grounded; the base of the triode Q2 is connected with a resistor, the collector is connected with the switch diode D2, and the emitter is grounded; the triode Q1 controls whether the alarm sounding device works, and Q2 stabilizes the circuit of the alarm device.

4. The process DCS interlock trip signal alarm device based on intermediate relay contact monitoring according to claim 1 or 3, characterized in that, The anode of the switch diode D2 is connected with the collector of the triode Q2, the cathode of the switch diode D2 is connected with a resistor, the switch diode D2 prevents the reverse current from affecting the circuit, stabilizes the voltage of the circuit, and avoids the abnormal voltage fluctuation from interfering with the normal work of the alarm sounding device.

5. The process DCS interlock trip alarm device based on intermediate relay contact monitoring according to claim 1, characterized in that, The operational amplifier SF324a and SF324b form the alarm sounding device, and specifically include: The operation amplifier SF324a includes 4th pin, 9th pin, 10th pin and 11th pin outside; the operation amplifier SF324b includes 12th pin, 13th pin and 14th pin outside; the 4th pin of the operation amplifier SF324a is connected with positive power supply, the 11th pin is connected with ground, the 4th pin level of SF324a is controlled by the triode Q1 to open the power supply; the 9th pin and the 10th pin of SF324a and the peripheral resistance and capacitance elements constitute an oscillation circuit to generate a frequency signal, the signal is transmitted to the 12th pin of SF324b, the 13th pin is connected with the triode Q2 and the capacitor C2, the signal is output from the 14th pin after being amplified by SF324b, the piezoelectric ceramic sheet HTD is driven to emit an alarm sound to perform alarm sound emission.

6. The process DCS interlock trip signal alarm device based on intermediate relay contact monitoring according to claim 5, characterized in that, One end of the piezoelectric ceramic sheet HTD is connected with the output end of the operation amplifier SF324b, and the other end is connected with ground; when the monitoring trigger device detects the process DCS interlocking parking signal, the piezoelectric ceramic sheet HTD receives the electric signal output by the operation amplifier and converts it into mechanical vibration to emit an alarm sound and remind the electrical operator that the motor is stopped due to the process DCS interlocking.

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